Issue warning for enum with no members in stub (#18068) #468

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	17m 38s
Test mypyc suite with 32-bit Python	6m 57s
Test suite with py38-windows-64	20m 1s
Test suite with py39-ubuntu	17m 9s
Test suite with py310-ubuntu	15m 40s
Test suite with py311-ubuntu, mypyc-compiled	16m 31s
Test suite with py312-ubuntu, mypyc-compiled	18m 9s
Test suite with py313-ubuntu, mypyc-compiled	18m 12s
mypyc runtime tests with py39-macos	4m 46s
Type check our own code (py38-ubuntu)	1m 55s
Type check our own code (py38-windows-64)	2m 17s
Formatting and code style with Black + ruff	53s
	2h 20m 8s

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